Key fob doesn't connect

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Has anyone else had this ... 2004 XK8 convertible.

Both key fobs transmit (tested) but neither will unlock the car.

When placed in the lock and turned to the left the keys don't open the roof at all.

The keys will unlock the car but I have to place the key in the ignition to disable the alarm (of course) which will start to sound. I had a new car battery in February (Mutlu 075 Series 2 Car 12V 60Ah 540A (SAE) 510 A) which is in excellent nick .... I have just  completed a 3000 mile trip across France and Italy so it's well charged. I've had the car in the garage for a week and my mechanic says the control unit seems to be OK and functions within the car and both keys transmit but as I say don't appear to connect to the unit. I've also had a locksmith security expert (huh!!!) who couldn't diagnose the problem.

There are no codes showing.

Any idea guys? 

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